add_executable(1_Convert_A_String_of_Number_into_A_Integer "1_Convert_A_String_of_Number_into_A_Integer.c")
add_executable(2_Find_Substring "2_Find_Substring.c")
add_executable(3_Count_Duplicate_Character.c "3_Count_Duplicate_Character.c")
add_executable(4_Caesar_Cipher "4_Caesar_Cipher.c")
